The Immortal Conquistador by Carrie Vaughn

"A must have for Kitty Norville fans, but also an excellent standalone for readers new to Vaughn's worlds." —Kelley Armstrong, author of Bitten
From the author of the beloved Kitty Norville werewolf DJ host series, the last full tale in the series: the vampire origins of Kitty's famed ally, Rick—and his sudden turn to darkness in the seventeenth century.
Ricardo de Avila would have followed Coronado to the ends of the earth. Instead Ricardo met with the end of his mortal life—and a new one, as the renegade vampire, Rick.
For over five hundred years, Rick has infuriated the demon world. He has ferociously protected his found-family from marauding vampires, joined forces with a legendary gunslinger, appointed himself the Master of Denver, and called upon a church buried under the Vatican. Of late, Rick has even made a famous friend: everyone's favorite supernatural talk-show host, Kitty Norville.
Now, whether you are new to Vaughn's fan-favorite novels, or a longtime reader, you'll be riveted by the final full-length tale of the series.
About the Kitty Norville series:
Carrie Vaughn's series, about a werewolf who hosts a talk radio advice show for the supernaturally disadvantaged, began with Kitty and the Midnight Hour. The series will end with the The Immortal Conquistador, and the forthcoming collection Kitty's Mix-Tape. For more about the Kitty Norville books, go to https://carrievaughn.com/kittybooks.html.